Valve-gear



(No Model.) 3 Sheets-Sheet 1.

J. T. HALSEY.

VALVE GEAR.

N0. 402,923. Patented May 7, 1889.

"INVENTOR:

WITNESSES I N PETERS. Phulvulhngnpher, Wnmnhon. ole

(No Model.) 3 Sheets-Sheet 2.

- J. T. HALSEY.

VALVE GEAR.

No. 402,923. Patented May 7, 1889.

\LNVENTOR:

N4 PETERS, PhuQoJ-flhvgr lpher. Washington, 0.0.

(No Model.) 3 Sheets-Sheet 3'.

' J. T. HALSEY.

VALVE GEAR.

No. 402,923. Patented May 7, 1889.

INVENTOR:

0, m mmm N4 PETERS. PholoLilhognpher. Waihmgtnn. n. c

. UNITED STATES PATENT OFFICE.

JAMES HALSEY, OF FATERSON, NEW JERSEY.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 402,923, dated May '7,1889.

Application filed June 15, 1888. Serial No. 277,281. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES T. HALsEY, a citizen of the United States, anda resident of Paterson, in the county of Passaic and State of NewJersey, have invented certain Improvements in Valve-Gear for Steam andother Engines, of which the following is a specification.

My invention relates to that class of valvegear wherein an eccentric isemployed for actuating the valve of the engine; and my object is, inpart, to provide a novel mode of operating both the main and cut-offvalves of an engine by means of one eccentric, and, in part, to providea shifting eccentric controlled by the governor for varyingthe lead,cut-0E, and compression, said shifting eccentric being employed to givethe proper motion to the valve or valves.

My invention will be fully described hereinafter, and its novel featurescarefully defined in the claims.

In the drawings which serve to illustrate my invention, Figure 1 is aside elevation of an engine provided with my improved valvegear. Fig. 2is a side elevation of the shifting eccentric detached. Fig. 3 is a sideelevation of one form of the eccentric yoke or strap and its attachmentsfor actuating the valve-rods. The eccentric is seen in section in thisview. Fig. 3 is a sectional View on line 3 3 in Fig. 3. Fig. 4 is a planview of the eccentric, its strap, and adjacent parts, the fly-wheel rimbeing broken away to show the parts within it. Figs. 5, 6, 7, 8, and 9illustrate other modes of connecting the valverods to the strap of theeccentric for obtaining the proper relative motions of the main andcut-off valves. In Fig. 1 I have broken away a part of the walls of thevalve-chamber and the main valve in order to show the cutoff valve.

A is the bedplate of the engine; 13, the engine-cylinder; O, the main orcrank shaft, and D the fiy-wheel on shaft 0. These parts may be of theordinary construction.

I have shown a governor carried by the flywheel. This governor comprisestwo like weights, a a attached, respectively, to arms b b hung at 0 a toopposite arms of the flywheel D. Rotation of the wheel tends to throwout these weights by centrifugal force, and

plate, G, (seen best in Fig. 2,) which is piV- oted at 00 to one of thefly-wheel arms and adapted to swing on said pivot m as a center ofoscillation. WVhen plate G is thus swung, it changes the relativepositions of the center of the eccentric with the main shaft, and thusvaries the throw and the point at which the valves open and close theports.

The carrier plate is shifted by the governor through thefollowing-described means: In the said plate G is a slot, g, on the sideof the main shaft opposite to the pivot-point m, and in this slot playsa slide-block, g, which has a hole to receive a pin or stud, g on one ofthe governor-weights a. The axis of the slot 9 is oblique to the pathtraversed by stud g when the weight a moves, and consequently anymovement of said weight radially to the fly-wheel will swing thecarrier-plate, and with it the eccentric, and vary the lead of thelatter. The plate G is guided in its movement, and is kept up snugly tothe face of the fly-wheel by means of bolts h in lugst' on the fly-wheelboss, said bolts engaging slots j in the plate G.

H is the eccentric yoke or strap. (Seen in elevation in Fig. 3.) In thisyoke is fixed a laterally-projecting stud or wrist-pin, k, which has abearing in a slide, Z, that plays in a guide, m, bolted to the side ofthe bed-plate. Above the pin is another pin, a, in the yoke of a similarcharacter to pin is, and to this pin n is coupled the rod 0 of thecut-off valve I, said rod being coupled to the stem 0 of the saidcut-off valve. To the slide 1 is secured the rod p of the main valve J,said rod being secured rigidly to the tubular stem 19' of said mainvalve. In the construction shown in the principal figures the stem ofthe cut-0E valve I plays through the tubular stem of the main valve 1;but this is not essential to nor does it form a part of my presentinvention. The main slide-valve and its cut-off valve may beconstructed, in any well-known way, and not necessarily as hereinillustrated.

Both valves are actuated by the same eccentric and yoke, themain valvebeing moved to and fro a distance substantially equal to the throw ofthe eccentric. The cut-off valve is moved to and fro by the rockingmotion of the yoke on the pivotal point 71:. As the point n, Fig. 3,rocks or oscillates about the point as a center, it will be seen thatwhen the eccentric revolves the cut-off valve will be carried to and frowith the main valve, and at the same time it will have imparted to it anindependent movement on said main valve, thus effecting the cut-off inthe usual way. 3y arranging the axis of the guide or slide way in. topass, if prolonged, to one side of shaft C, (below as arranged in Fig.1,) I am enabled to bring the main valve substantially to a state ofrest at the end of its stroke and to maintain it at rest for aconsiderable time at this point.

In Figs. 5, 6, and 7 I have shown other modes of coupling the valve-rodsto the yoke of the eccentric. In Fig. 5 the coupling is made direct, asin Fig. 3, but the rods p and 0 are con nected, respectively, to lugs sand t on the eccentric-yoke on opposite sides of the pivotal point ofthe yoke. In a slot, q, in the yoke is fitted a block, '7', which turnson a stud, r, in the bed-plate of the engine or in some other fixedpart. The yoke plays on the block 4" in its movement to and fro. In Fig.6 the stud or pin a is in a downwardly-projecting arm, and the rod 0 isconnected to the stem 0 through the medium of a rock-1ever, u, fulcrumedon a block or collar on the rod 1). In Fig. 7 the eccentric-yoke iscoupled to the rod 13 of the main valve in substantially the same manneras seen in Fig. 3, and the yoke imparts its motion to the stem 0 of thecut-off valve through the medium of a link, '17, which connects the yokewith one arm of an elbow-lever, n, the other arm of which is coupled toa rocklever, 11, by the rod 0. By properly proportioning the arms of theseveral. intermediate levers almost any desired extent of and kind ofmotion maybe imparted to the cut-off valve by the yoke of the eccentric,and this intervention of levers-sueh as r and u--forms an important partof my invention.

Fig. 8 is a side view similarto Figs. 5, 6, and 7, illustrating anotherform of my valve-gear, wherein a roekarm, Z, is substituted for theslide Z and its guide in order to get a movement in a substantiallystraight line. This arm and the slide Z are only two equivalent forms ofcarriers for coupling of the yoke to the valve rod.

Fig. 9 is a sectional front view of this device, the plane of thesection being indicated by line 0 9 in Fig. 8. The rock-arm Z is coupledto the yoke at 7x, and to its upper vibrating end is coupled the upperend of a rock-lever, u, mounted on the yoke. The

lower end of this lever '21, is coupled to the stem 0' of the cutoffvalve. The main valvestcm p is actuated through a rod, 1), connected tothe rock-arm Z. This construction has special advantages, as it enablesme to extend the arm of the eccentric-yoke out far enough to clear thefly-wheel and other parts of the mechanism of the engine.

In Figs. 5, 6, 7, S, and 9 I have omitted all the accessory parts inorder to avoid obscuring the parts it was desired to fully illustratetherein. These accessories may be the same as those seen in theotherfigures of the drawings.

The valves shown in Fig. 1 are embodied in another application of mine,and I have not deemed it necessary to fully illustrate them in theaccompanying drawings.

The slot g in carrier-plate G" (see Fig. 2) may be formed integrally inthe plate; but I prefer to form it as illustrated in the drawings, forconvenience in dressing its faces and for repairing it when worn away.

The regulator F of the governor is a closed cylinder filled with oil orother liquid, in which loosely plays a piston on the prolongation of rodf which enters the cylinder through a stuffing-box. This device preventsthe governor-weights from moving in or out too suddenly when actuated byantagonistic forces.

The block '1' (seen in Fig. and the block g on the stud in thegovernor-weight a are only contrivances of a well-known kind to providea bearing-surface and prevent the wear of the pin. They are notessential to the working of the invention.

Having thus described my invention, I claim-- 1. A valve gear comprisinga shifting eccentric loosely embracing and carried by the engineshaft, agovernor connected with and cont-rolling the shifting movements of saideccentric, the yoke of said eccentric, and the rods of the main valveand cut-off valve of the engine, both coupled to and actuated by saidyoke, whereby the movements of both of said valves are controlledsimultaneously by the governor.

2. The combination, with a shaft driven. by an engine and a wheelthereon, of an eccentric loosely embracing said shaft, a carrierplatewhich bears said eccentric, said carrierplate being pivotally mounted onsaid wheel and provided with a slot, the governor-weight carried aroundby said shaft and provided.

said plate, the spring attached to said weight, the yoke of theeccentric, and the valve-rods coupled to said yoke, substantially as setforth.

4. In a valve-gear wherein the main and cut-off valves are both actuatedby one eccentric and its yoke, the combination, with said eccentric andyoke and the valve-rods and valves, of a rock-lever arrangedintermediate between one of said valves and the yoke of the eccentricwhich actuates said valve.

5. In a valve-gear, the combination, with an eccentric carried by theengine-shaft and its yoke, of a carrier to which said yoke is coupled,the main-valve rod coupled to said carrier, and the cut-off-valve rodcoupled to said yoke, the axis of the path in which said coupling playsbeing arranged to pass, if prolonged, to one side of the axis of theshaft carrying the eccentric, substantially as and for the purposes setforth.

6. In a valve-gear, the combination, with an eccentric carried by theengine-shaft and its yoke, of the main-valve rod operated by saideccentric, the stem and rod of the cut-off valve, an d intermediatelevers between the said yoke and the stem of the cut-off valve,substantially as set forth.

7. .In a Valve-gear, the combination, with an eccentric carried by theengine-shaft and its yoke, of a carrier coupled to the yoke, themain-valve rod coupled to said carrier, a rocklever fulcrumed on andcarried by the mainvalve rod, the cutoff-valve stein coupled to one endof said rook-lever, and the cut-offvalve rod coupling the other end ofsaid rocklever with the yoke of the eccentric, substantially as setforth.

8. In a valve-gcar,tl1c combination, with an eccentric carried by theengine-shaft and its yoke, of a carrier to which said yoke is coupled,the main-Valve rod coupled to said carrier, the vibrating elbow-lever,the link coupling one arm of said elbow-lever to the yoke, and

.the cut-off-valve rod coupled to the other arm elbow-lever, as '0', alink coupling one arm of said lever to the eccentric-yoke, and the rod0, coupling the other arm of said elbow-lever with the other arm of therock-lever a, substantially as set forth.

10. In a valve-gear wherein the main and cut-off valves are both drivenfrom the same eccentric and its yoke, the combination, with saideccentric and yoke, of a rock-arm to which the said yoke is coupled, themain-valve rod coupled to said rock-arm, a rock-lever pivotally mountedon the yoke and coupled at its upper end to the upper end of saidrock-arm, and the cut-off-valve stem coupled to the other end of saidrock-lever, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

JAMES T. HALSEY.

Witnesses:

Jos. A. BERGEN, HENRY E. SAMUELS.

